JPH03288163A - Two-component developer capable of bar code printing - Google Patents
Two-component developer capable of bar code printingInfo
- Publication number
- JPH03288163A JPH03288163A JP2090013A JP9001390A JPH03288163A JP H03288163 A JPH03288163 A JP H03288163A JP 2090013 A JP2090013 A JP 2090013A JP 9001390 A JP9001390 A JP 9001390A JP H03288163 A JPH03288163 A JP H03288163A
- Authority
- JP
- Japan
- Prior art keywords
- carrier
- toner
- component developer
- bulk density
- specific surface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims description 11
- 238000010186 staining Methods 0.000 abstract description 3
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- WZCQRUWWHSTZEM-UHFFFAOYSA-N 1,3-phenylenediamine Chemical compound NC1=CC=CC(N)=C1 WZCQRUWWHSTZEM-UHFFFAOYSA-N 0.000 description 1
- 235000007173 Abies balsamea Nutrition 0.000 description 1
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 238000004438 BET method Methods 0.000 description 1
- 239000004857 Balsam Substances 0.000 description 1
- 239000004859 Copal Substances 0.000 description 1
- 241000782205 Guibourtia conjugata Species 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 244000018716 Impatiens biflora Species 0.000 description 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 1
- 229920001800 Shellac Polymers 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- 239000004841 bisphenol A epoxy resin Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 239000000025 natural resin Substances 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000004208 shellac Substances 0.000 description 1
- ZLGIYFNHBLSMPS-ATJNOEHPSA-N shellac Chemical compound OCCCCCC(O)C(O)CCCCCCCC(O)=O.C1C23[C@H](C(O)=O)CCC2[C@](C)(CO)[C@@H]1C(C(O)=O)=C[C@@H]3O ZLGIYFNHBLSMPS-ATJNOEHPSA-N 0.000 description 1
- 229940113147 shellac Drugs 0.000 description 1
- 235000013874 shellac Nutrition 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229940037312 stearamide Drugs 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- -1 vinyl resins, acrylic Chemical compound 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は二成分系現像剤、特に高速プリンター用として
好適で、バーコード印字可能な二成分系現像剤に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a two-component developer, particularly a two-component developer suitable for use in high-speed printers and capable of printing bar codes.
［従来の技術］
従来、トナー現像に使用される二成分系現像剤にあって
は、トナーとキャリアとが摩擦することによって生ずる
クーロンの力を利用するので、両者をよく摩擦させる必
要がある。しかるにトナーは樹脂粉で構成されているた
め柔らかいが、キャリアは金属などの硬い材料で形成さ
れているため、両者を摩擦させると、キャリア表面がト
ナーによって次第に汚されてくる。このトナーによるキ
ャリアの汚れは、高速プリンターにおいては、特にトナ
ーとキャリアとが激しくぶつかり合うため、大きな問題
であり、長時間にわたって安定な摩擦帯電を得ることは
困難である。[Prior Art] Conventionally, two-component developers used for toner development utilize Coulomb force generated by friction between toner and carrier, so it is necessary to cause good friction between the two. However, the toner is soft because it is made of resin powder, but the carrier is made of a hard material such as metal, so when the two are rubbed, the surface of the carrier becomes gradually stained by the toner. This contamination of the carrier by toner is a serious problem especially in high-speed printers because the toner and carrier collide violently, and it is difficult to obtain stable triboelectric charging over a long period of time.
特に、大面積の黒化部を有するバーコード印字の場合に
は短時間に黒化部が白抜は状態になってしまうという問
題がある。In particular, in the case of barcode printing having a large area of blackened areas, there is a problem in that the blackened areas turn into white areas in a short period of time.
［発明が解決しようとする課題］
本発明者らは、かかる従来技術の現状に鑑みその改良対
策について鋭意検討した結果、二成分系現像剤を構成す
るキャリアを特定の比表面積およびかさ密度を有する鉄
粉で構成した場合には従来の二成分系現像剤に見られる
ような欠点が良好に解決できることを知見し、本発明に
到達したものである。[Problems to be Solved by the Invention] In view of the current state of the prior art, the present inventors have conducted extensive studies on improvement measures, and have found that the carrier constituting the two-component developer has a specific specific surface area and bulk density. The present invention was achieved based on the finding that the drawbacks of conventional two-component developers can be satisfactorily overcome when the developer is made of iron powder.
したがって、本発明の目的は、極めて良画質の画像を得
ることができるとともに、トナーによるキャリアの汚れ
が極めて少なく、高速プリンターにおいて大面積にわた
って黒化部を有するバーコード印字を長時間にわたって
安定に印字することを可能とする二成分系現像剤を提供
することにある。Therefore, an object of the present invention is to be able to obtain images of extremely high quality, have extremely little contamination of the carrier by toner, and stably print barcodes with blackened parts over a large area over a long period of time in a high-speed printer. The object of the present invention is to provide a two-component developer that enables the above-mentioned.
［課題を解決するための手段］
かかる本発明の目的は、トナーとキャリアとの混合物か
らなり、該キャリアはその比表面積が少なくとも２５０
ｃｍ２／ｇ以上であり、かつかさ密度が３．１０ｇ／ｃ
ｍ３以下である鉄粉からなることを特徴とするバーコー
ド印字可能な二成分系現像剤により達成される。[Means for Solving the Problems] The object of the present invention is to provide a mixture of a toner and a carrier, the carrier having a specific surface area of at least 250
cm2/g or more, and the bulk density is 3.10 g/c
This is achieved using a two-component developer capable of printing barcodes, which is characterized by being made of iron powder having a particle size of less than m3.
すなわち、本発明はキャリアとトナーの二成分系現像剤
からなるもので、ここで使用されるキャリアとしては鉄
粉から構成され、かつその比表面積が２５０ｃｍ２／ｇ
以上であることが必要であり、これにより摩擦帯電の安
定性を確実に保持することができるため大面積の黒化部
の安定な印字が可能となるのである。より好ましくは２
７０ｃｍ ２ ／ ｇ以上である。キャリアの比表面積
の上限については特に限定されないが、キャリアの組成
が鉄であることおよびキャリアの製造条件の限界などの
点からは７５０ｃｍ２／ｇ以下であることが好ましい。That is, the present invention consists of a two-component developer consisting of a carrier and a toner, and the carrier used here is composed of iron powder and has a specific surface area of 250 cm2/g.
This is necessary, and as a result, stability of frictional charging can be maintained reliably, and stable printing of a large area of blackened portions is possible. More preferably 2
It is 70 cm 2 / g or more. The upper limit of the specific surface area of the carrier is not particularly limited, but it is preferably 750 cm 2 /g or less in view of the composition of the carrier being iron and the limitations of the manufacturing conditions of the carrier.
ここで、キャリアの比表面積とは周知のＢＥＴ法により
求めたものである。Here, the specific surface area of the carrier is determined by the well-known BET method.
本発明において使用されるキャリアはこのように鉄粉か
ら構成され、かつその比表面積が２５００ｍ２／ｇ以上
であるとともに、さらに、そのかさ密度が３．１０ｇ／
ａｍ３以下であることが必要である。The carrier used in the present invention is thus composed of iron powder, has a specific surface area of 2500 m2/g or more, and has a bulk density of 3.10 g/g.
It is necessary that it is below am3.
かさ密度を３．１０ｇ／ｃｍ３以下となすことによりト
ナーとキャリアのぶつかり合うときの衝撃を効果的に緩
和させることができるため、印字の寿命を確実に延長さ
せることができる。特に、大面積の黒化部のあるバーコ
ード印字に適用した場合にはこの効果を顕著に発揮させ
ることができる。By setting the bulk density to 3.10 g/cm 3 or less, it is possible to effectively alleviate the impact caused when the toner and carrier collide, so that the life of printing can be reliably extended. In particular, this effect can be brought out significantly when applied to barcode printing with a large area of blackened parts.
キャリアのかさ密度はより好ましくは２．９０ｇ／ｃｍ
３以下である。キャリアのかさ密度の下限については特
に限定されないが、キャリアの組成が鉄であることおよ
びキャリアの製造条件の限界などの点からは２．５０ｇ
／ｃｍ３以上であることが好ましい。The bulk density of the carrier is more preferably 2.90 g/cm
3 or less. The lower limit of the bulk density of the carrier is not particularly limited, but it is 2.50 g from the viewpoint of the composition of the carrier being iron and the limitations of the manufacturing conditions of the carrier.
/cm3 or more is preferable.
ここで、かさ密度とはＪＩＳ Ｚ２５０４により求め
たものである。Here, the bulk density is determined according to JIS Z2504.
キャリアとトナーとの混合割合は、個々のキャリアの表
面をトナーが単層で覆うことのできる程度の量のトナー
を含んでいることが好ましく、重量比で９９．５：０．
５〜５０ ： ５０の範囲であることが望ましい。そし
て、本発明による現像剤によれば、前述のごとき特定の
キャリアとトナーとが摩擦し合うことにより、トナー、
したがって現像剤に一定極性の電荷を確実に保持せしめ
ることができるものである。The mixing ratio of carrier and toner is preferably 99.5:0 by weight, so that the toner can cover the surface of each carrier in a single layer.
A range of 5 to 50:50 is desirable. According to the developer according to the present invention, the specific carrier and toner as described above rub against each other, so that the toner,
Therefore, it is possible to ensure that the developer retains an electric charge of a constant polarity.
本発明において使用されるキャリアの粒径としては、特
に限定されないが、１０〜３００μｍ程度の平均粒子径
を有するものから選択するのが好ましい。The particle size of the carrier used in the present invention is not particularly limited, but it is preferably selected from those having an average particle size of about 10 to 300 μm.
また、本発明において使用されるトナーとじては、バル
サム、ロジン、シェラツクおよびコーパルなどの天然樹
脂や、これらの変性樹脂、ビニル樹脂、アクリル樹脂、
オレフィン樹脂、ポリアミド樹脂、ポリエステル樹脂、
アルキド樹脂およびエポキシ樹脂（例えばビスフェノー
ルＡ型エポキシ樹脂など）などの合成樹脂、天然ゴムや
合成ゴムのような材料から構成することができ、その平
均粒子径としては５〜３０μｍの範囲のもの使用するの
がよい。The toner used in the present invention includes natural resins such as balsam, rosin, shellac, and copal, modified resins of these resins, vinyl resins, acrylic resins,
Olefin resin, polyamide resin, polyester resin,
It can be composed of synthetic resins such as alkyd resins and epoxy resins (e.g. bisphenol A type epoxy resins), natural rubber and synthetic rubber, and the average particle diameter used is in the range of 5 to 30 μm. It is better.
これらの材料は単独で使用してもよいが２種以上の材料
を混合して使用することもできる。またこれらの単成分
や混合物には、熱または圧力による定着あるいは熱と圧
力による定着を一層容易にする目的で、脂肪族ロウ、脂
肪酸の金属塩および合成樹脂の低分子化合物などの低融
点物質を含有させることもできる。さらに、トナーの内
部または表面に荷電調節剤、顔料や染料などが含まれて
いてもよい。These materials may be used alone, but two or more types of materials may be used in combination. In addition, low-melting substances such as aliphatic waxes, metal salts of fatty acids, and low-molecular compounds of synthetic resins may be added to these single components or mixtures in order to further facilitate fixing by heat or pressure, or by heat and pressure. It can also be included. Furthermore, a charge control agent, pigment, dye, etc. may be contained inside or on the surface of the toner.
本発明に係る二成分系現像剤は、特にバーコード印字に
好適であるとともに、プリント速度がＡ４判で３０枚／
分ないし５０枚／分といった高速プリンターにおいても
実用上支障のない通常要求されいる、Ａ４判で６０万枚
以上の現像剤寿命を確実に達成できるものである。The two-component developer according to the present invention is particularly suitable for barcode printing, and has a printing speed of 30 sheets/A4 size.
It is possible to reliably achieve a developer life of 600,000 sheets or more for A4 size, which is normally required without any practical problems even in high-speed printers of 50 sheets per minute to 50 sheets per minute.
［実施例］
以下実施例により本発明を具体的に説明するが、本発明
はこれに限定されない。[Example] The present invention will be specifically described below with reference to Examples, but the present invention is not limited thereto.
実施例１ パウダーチック社製の鉄粉キャリアを３種類用意した。Example 1 Three types of iron powder carriers made by Powder Chick were prepared.
これらの特性値を次に示す。These characteristic values are shown below.
キャリアの 比表面積 かさ密度種類
（ｃｍ２／ｇ） （ｇ／ｃｍ３）キャリアＡ
１９１ ３．５２キヤリアＢ ２６６
３，１１キヤリアＣ２７７２，８８
次に、下記の組成からなるトナー原料組成物を用意した
。なお、オイルブラックＢＹ、カーボンブラックおよび
ステアリン酸アミドはそれぞれ荷電調節剤、顔料および
低融点物質である。Specific surface area of carrier Bulk density type
(cm2/g) (g/cm3) Carrier A
191 3.52 Carrier B 266
3,11 Carrier C2772,88 Next, a toner raw material composition having the following composition was prepared. Note that oil black BY, carbon black, and stearic acid amide are a charge control agent, a pigment, and a low melting point substance, respectively.
〈トナー原料組成物の組成〉
ビスフェノールＡ系エポキシ樹脂
８４重量％
オイルブラックＢＹ ７重量％カーボンブ
ラック ７重量％ステアリン酸アミド
２重量％次いで、上記トナー原料組成物を１５
０℃で溶融、混練し、室温まで冷却した後、ジェットミ
ルを用いて粉砕し、さらに風力分級して、平均粒子径が
１１μｍのトナーを得た。<Composition of toner raw material composition> Bisphenol A epoxy resin 84% by weight Oil black BY 7% by weight Carbon black 7% by weight Stearamide
2% by weight, then 15% of the above toner raw material composition.
The mixture was melted and kneaded at 0° C., cooled to room temperature, pulverized using a jet mill, and further classified by air to obtain a toner having an average particle size of 11 μm.
次に、上記３種のキャリアとトナーとを、トナーと各キ
ャリアとが重量比でそれぞれ４．５：９５．５になるよ
うに混合し、３種の二成分系現像剤Ａ、Ｂ、およびＣを
得た。Next, the above three types of carriers and toner are mixed so that the weight ratio of the toner to each carrier is 4.5:95.5, and the three types of two-component developers A, B, and I got a C.
次いで、富士通■製の高速レーザプリンターＦ６７００
Ｄ （プリンタ速度１４７枚／分）を用い、これに上記
３種の現像剤Ａ、ＢおよびＣをそれぞれ使用して１イン
チ角の大面積ベタ黒印字を行った。結果を次に示す。Next, a high-speed laser printer F6700 manufactured by Fujitsu ■
D (printer speed: 147 sheets/min) and the three types of developers A, B, and C described above were used to perform solid black printing on a large area of 1 inch square. The results are shown below.
使用現像剤 寿命（Ａ４判による）現像剤Ａ
５万枚
現像剤８ ６０万枚
現像剤Ｃ１００万枚
本発明を満足する現像剤ＢおよびＣの場合には、良質の
画像がそれぞれ寿命６０万枚および１００万枚で得られ
たが、現像剤Ｃの場合には５万枚にすぎなかった。Developer used: Lifespan (according to A4 size) Developer A
50,000 sheets Developer 8 600,000 sheets Developer C 1,000,000 sheets In the case of Developers B and C that satisfy the present invention, good quality images were obtained with lifespans of 600,000 sheets and 1 million sheets, respectively. In the case of C, it was only 50,000 pieces.
［発明の効果］
本発明は上述のごとく構成したので、極めて良画質の画
像を得ることができるとともに、トナーによる汚れが極
めて少なく、高速プリンターにおいて大面積にわたって
黒化部を有するバーコード印字を長時間にわたって安定
に印字することできるという顕著な実用効果を奏するも
のである。[Effects of the Invention] Since the present invention is configured as described above, it is possible to obtain an image of extremely high quality, and there is extremely little staining due to toner, and it is possible to print a bar code having a blackened portion over a large area for a long time in a high-speed printer. This has the remarkable practical effect of being able to print stably over time.
Claims (1)
はその比表面積が少なくとも２５０ｃｍ＾２／ｇ以上で
あり、かつかさ密度が３．１０ｇ／ｃｍ＾３以下である
鉄粉からなることを特徴とするバーコード印字可能な二
成分系現像剤。1. Consisting of a mixture of toner and carrier, the carrier is characterized by being composed of iron powder having a specific surface area of at least 250 cm^2/g and a bulk density of 3.10 g/cm^3 or less. A two-component developer that can print barcodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2090013A JP2596165B2 (en) | 1990-04-04 | 1990-04-04 | Barcode printable two-component developer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2090013A JP2596165B2 (en) | 1990-04-04 | 1990-04-04 | Barcode printable two-component developer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03288163A true JPH03288163A (en) | 1991-12-18 |
| JP2596165B2 JP2596165B2 (en) | 1997-04-02 |
Family
ID=13986796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2090013A Expired - Lifetime JP2596165B2 (en) | 1990-04-04 | 1990-04-04 | Barcode printable two-component developer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2596165B2 (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5414238A (en) * | 1977-07-05 | 1979-02-02 | Konishiroku Photo Ind Co Ltd | Iron powder developing carrier used in development of electrostatic image and its production and developer and image forming method |
| JPS54153635A (en) * | 1978-05-25 | 1979-12-04 | Konishiroku Photo Ind Co Ltd | Detecting and controlling method of toner contents in developer and device for said method |
| JPS5796353A (en) * | 1980-12-06 | 1982-06-15 | Mita Ind Co Ltd | Two component system developer for magnetic brush development |
| JPS60172060A (en) * | 1984-02-17 | 1985-09-05 | Mita Ind Co Ltd | Method for developing electrostatic image |
| JPS61140952A (en) * | 1984-12-12 | 1986-06-28 | Konishiroku Photo Ind Co Ltd | Electrostatic image developing carrier material and its preparation |
| JPH01225962A (en) * | 1988-03-04 | 1989-09-08 | Hitachi Chem Co Ltd | Developer for magnetic brush development |
| JPH03233334A (en) * | 1990-02-08 | 1991-10-17 | Nec Corp | Semiconductor pressure sensor |
| JPH03233464A (en) * | 1989-12-18 | 1991-10-17 | Paudaa Tec Kk | Carrier for electrophotographic developer, production thereof and developer formed by using this carrier |
-
1990
- 1990-04-04 JP JP2090013A patent/JP2596165B2/en not_active Expired - Lifetime
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5414238A (en) * | 1977-07-05 | 1979-02-02 | Konishiroku Photo Ind Co Ltd | Iron powder developing carrier used in development of electrostatic image and its production and developer and image forming method |
| JPS54153635A (en) * | 1978-05-25 | 1979-12-04 | Konishiroku Photo Ind Co Ltd | Detecting and controlling method of toner contents in developer and device for said method |
| JPS5796353A (en) * | 1980-12-06 | 1982-06-15 | Mita Ind Co Ltd | Two component system developer for magnetic brush development |
| JPS60172060A (en) * | 1984-02-17 | 1985-09-05 | Mita Ind Co Ltd | Method for developing electrostatic image |
| JPS61140952A (en) * | 1984-12-12 | 1986-06-28 | Konishiroku Photo Ind Co Ltd | Electrostatic image developing carrier material and its preparation |
| JPH01225962A (en) * | 1988-03-04 | 1989-09-08 | Hitachi Chem Co Ltd | Developer for magnetic brush development |
| JPH03233464A (en) * | 1989-12-18 | 1991-10-17 | Paudaa Tec Kk | Carrier for electrophotographic developer, production thereof and developer formed by using this carrier |
| JPH03233334A (en) * | 1990-02-08 | 1991-10-17 | Nec Corp | Semiconductor pressure sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2596165B2 (en) | 1997-04-02 |
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